|Experimental Investigations on Influence of Carbon Composite Fibres in Concrete - D. Aditya Sai Ram and Ch. Surendra Reddy|
The use of short pitch-based carbon fibres (0.05% of weight of cement, 0.189 vol. % Concrete),together with a dispersant, chemical agents and silica fume, in concrete with fine and coarse aggregates resulted in aflexural strength increase of 85%, and a flexural toughness increase of 205%, a compressive strength increase of22%, and a material price increase of 39%. The slump was 4 in at a water/cement ratio of 0.50...
Keywords: Carbon fibres; Compressive Strength; Tensile Sterngth
|17. Eng Variation In Strength Of Concrete Subjected To High Harshal Mundle - H. G. Mundle|
The influence of elevated temperatures on mechanical properties of concrete is of very much important for fire resistance studies and also for understanding the behavior of containment vessels, chimneys, nuclear reactor pressure vessels during service and ultimate conditions structures like storage tanks for crude oil, hot water, coal gasification, liquefaction vessels used in petrochemical industries, foundation for blast furnace and coke industries, furnace walls industrial chimney, air craft ...
Keywords: Elevated Temperature; Ordinary Conventional Concrete; Compressive Strength
|6. General Engg IJGET INFLUENCE OF GAS OIL ON Iraq Raid Al Khateeb|
This research studies the effect of water/gas oil on the compressive strength properties of the concert. The concrete cubic specimens were prepared by using sulfate resistance cement (AL-Muthanna cement) with mixing ratio (1:1.5:3) (cement: sand: coarse aggregate) concrete specimen cubic was prepared and socked in water and a mixture of water/gas oil (30%-70%) at room temperate for immersion age (7-28-56-88-118-148) days...
Keywords: Concrete Mixture; Compressive Strength; Socking; Gas Oil
|6. Strength Assessment.full|
This paper presents the effect of sodium hydroxide (NaOH) present in the curing water on the strength of fly ashcement concrete(FACC). The concrete is produced by mixing of % replacement of cement by fly ash and curing watercontaining NaOHof 5% concentration with constant dosages.This research work describes the feasibility of using the fly ash (Class-F) in concrete production as partial replacement of cement by weight.The cement has been replaced by fly ash accordingly in the range of 0% (witho...
Keywords: Fly Ash Cement Concrete; Compressive Strength; Regression Models; Sodium Hydroxide
|10. Civil IJCSEIERD Suitability Of Demolished Concrete Jayant Damodar Supe|
Normally coarse aggregate is the fractured stone obtained from rocks in hills or pebbles from river bed. Becauseof depletion of good conventional aggregate in certain regions, the need to find out substitute materials for coarseaggregate has become imperative for environment protection. Use of recycled demolished waste is one of the solutionsbecause waste disposal problem is a growing problem. Also saving of energy requirement in construction industry with useof locally available aggregates is o...
Keywords: Recycle Construction Aggregate; Demolished Structure; Compressive Strength; Models; Waste Concrete
|14. Civil IJCSEIERD Compressive Strength Of Green Concrete MANOJ KUMAR GHOSH|
This paper mainly focusing on the compressive strength and durability of bricks fabricated by the use of fly ashand polypropylene fiber from the site of national thermal power corporation korba, and bhilai chhattisgarh, central india asa partial replacement of 25%, 55% and 100% of sand due to high price as per the instruction of chhattisgarh statesmineral policy act and rules 2013 which is being used for construction work...
Keywords: Compressive Strength; Green Concrete; Fly Ash; Polypropylene and Curing
|23. Applied Eco Friendly Cement From Ceramic Waste E. El Fadaly - E. EL-FADALY, M. R. MOSTAFA, M. E. I. SARAYA, F. A. NASSAR, T. EL-SOKKARY & H. EL-DIDAMONY|
In ceramic tile production, because of various reasons, unsold fired products come out. These are waste tiles and only a little part of them is reused. If these waste tiles were used in geopolymer production, this pollution decreases. In this study, usage of waste tile as pozzolan was studied. The effect of sodium silicate solution with different molar ratio on the compressive strength of Egyptian ceramic waste -based geopolymers is investigated...
Keywords: Alkali Activation; Ceramic Waste; Compressive Strength; DTA; XRD; FT-IR
|22. Strength Feasibility.full|
This research paper presents the effect of sodium hydroxide (NaOH) present in the curing water on the strength of Recycled Coarse Aggregate Concrete(RCAC). The concrete is produced by mixing of % replacement of Natural Coarse Aggregate by Recycled Coarse Aggregate and curing water containing NaOH of 5% concentration with constant dosages.This research work describes the feasibility of using the Recycled Coarse Aggregate in concrete production as partial replacement of Natural Coarse Aggregate by...
Keywords: Recycled Coarse Aggregate Concrete; Compressive Strength; Regression Models; Sodium Hydroxide
|Experience in Application of “JET Grouting” for Installation of Substructures of Estates|
The purpose of this paper is the acquisition and analysis ofempirical data during the stabilization of foundation soil bythe application of “jet grouting” method.The object of the research is the installation of the foundationplate base under seismic forces at the construction of a newstadium of the football club “Krasnodar”.Before soil stabilization there was foreseen in‐situproduction work in arbitrary areas of the construction site.On the test work sites technological parameters of ...
Keywords: “JET Grouting”; Compressive Strength of a Soil‐Cement Element
|APPLICABILITY OF QUARRY SAND AS A FINE AGGREGATE IN THE PRODUCTION OF MEDIUM GRADE CONCRETE - B.S. Waziri, A.G Bukar and Y.Z.A. Gaji|
ABSTRACT Partial and total replacement of fine aggregate in conventional concrete with quarry sand has been empirically conducted with the view too examining primarily the compressive strength of the resulting composite and possible utilization of quarry sand as fine aggregate in the production of medium grade concrete. The results of the study revealed that its specific gravity, bulk density, porosity, water absorption, silt content, the impact value and the aggregate crushing value showed sati...
Keywords: KEYWORDS: Quarry sand; fine aggregate; concrete; compressive strength; mixes
|17. Experimenatal Study.full|
A strategy using distillery spent wash as admixture in concrete is presented in this paper. The properties of fresh and hardened concrete made with distillery spent wash are presented and discussed. Proportions of 0-1.25% of distilleryspent wash were added in concrete specimen, for the purpose of experimentation concrete mixes were designed for M20 grade. The compressive and flexural tests were conducted to study the strength, slump cone and compaction factor tests were conducted to study the wo...
Keywords: Distillery Spent Wash; Super Plasticizer; Workability; Compressive Strength; Flexural Strength
|30. Eng Experimental Study On Effect Of Sugar Pankaj N Bhat - YOGESH. R. SURYAWANSHI, PANKAJ N. BHAT, R. R. SHINDE, S. B. PAWAR & NAMRATA MOTE|
The present work deals with the results of experimental investigations on effect of sugar powder on setting time and compressive strength of cement and concrete. Effect of sugar on compressive strength of cement and concrete by using different brands of cement are studied. Sugar powder content is 0, 0.05, 0.075, 0.1, 0.15, and 0.2 % by weight of cement. Cube of size 70 mm X 70 mm X 70 mm for compressive strength test of cement...
Keywords: Sugar Powder (Retarding Agent); Compressive Strength; Different Types of Cement; Concrete
|2. Engineering Compressive Properties Of Polycarbonate Toughened Sreenivasalu|
Polycarbonate toughened epoxy-bamboo fiber composites are prepared by varying fiber mat content. The blend matrix Epoxy-PC with varying weight percentage (wt%) of PC content in epoxy are prepared. It is observed that the blend matrix epoxy PC containing 10% of weight of PC showed to have minimum compressive strength. With varying in fiber mat content, toughened epoxy-bamboo fiber composites have been developed and it is evident that the Compressive strength of the composites is increased with ...
Keywords: Poly Carbonate; Epoxy-PC Blend Matrix; Compressive Strength; and Fiber Mat Content
|14. Applied Experimental Investigation Neela Deshpande|
About 80 million tyres are part of 33 million vehicles manufactured in India in 2011. The usage of tyres for burning in cement kilns is up to 20000 tonnes per year. Landfill has been one of the methods for their disposal, however asrubber tyres are not biodegradable, they remain in the land for a long time causing environmental hazard. An alternative for this waste is use of the material in Concrete-A widely used material...
Keywords: Tyre Rubber; Rubberized Concrete; Shredded Rubber; Crumb Rubber; Compressive Strength; Split Tensile Strength
|13. Engineering Strength Performance Of Concrete Using Remya Raju|
Concrete is the most important engineering material and the addition of some other materials may change the properties of concrete. Studies have been carried out to investigate the possibility of utilizing a broad range of materials as partial replacement materials for cement and aggregate in the production of concrete. The present experimental study was conceived following the general purpose of testing new sustainable building processes and modern production systems, aims not only at saving na...
Keywords: Coal Bottom Ash; Concrete; Compressive Strength; Splitting Tensile Strength; Flexural Strength; Modulus of Elasticity
|11. Optimum .full|
This paper Present the experimental study of optimum replacement of natural sand with artificial sand in concrete Concrete is a mix proportion of cement, sand and aggregate. The strength of aggregate will affect on the strength ofconcrete. Nowadays we are facing a problem due to scarcity of natural sand. Hence it is necessary to find suitable substitute for natural sand. The artificial sand is one of the suitable substitutes to natural sand...
Keywords: Natural Sand; Artificial Sand; Concrete Mix; Compressive Strength; Split Tensile Strength; Flexural Strength
|High Temperature Oxidation of Boron Nitride - Jacobson, Nathan|
High temperature oxidation of monolithic boron nitride (BN) is examined. Hot pressed BN and both low and high density CVD BN were studied. It is shown that oxidation rates are quite sensitive to microstructural factors such as orientation, porosity, and degree of crystallinity. In addition small amounts of water vapor lead to volatilization of the B2O3 oxide as H(x)B(y)O(z). For these reasons, very different oxidation kinetics were observed for each type of BN.
Keywords: CRYSTAL STRUCTURE; ISOTHERMAL PROCESSES; MECHANICAL PROPERTIES; POLYIMIDE RESINS; AGING (MATERIALS); COMPRESSIVE STRENGTH; STABILITY
|Feasibility of Copper Slag – Fly Ash Mix as a Road Construction Material|
In this paper, an attempt has been made to study the feasibility of copper slag – fly ash mix for use in subbase course of the flexible pavements. A number of cylindrical test specimens (38 mm diameter and 76 mm height) were prepared with raw materials such as copper slag and fly ash in different proportions. These samples were cured at a temperature of 30 0C and relative humidity of 85% in a humidity controlled chamber for different curing period of 0, 7, 14 and 28 days. The geotechni...
Keywords: Copper Slag; Fly ash; Unconfined Compressive Strength; CBR; Triaxial Shear Strength
|17. Civil Experimental Ameer Mohsin Hashim|
The waste generated from the industries cause environmental problems. Hence the reuse of this waste material can be emphasized. To produce low cost concrete by replacing fine aggregate with stone waste(marble and granite) and to reduce disposal and pollution problems due to the use of stone waste. It is most essential to develop low cost building materials from stone waste. The innovative use of stone waste in concrete by replacing fine aggregate with this material was the other alternative of t...
Keywords: Compressive Strength; Flexural Strength; Split Tensile Strength; Permeability; Replacement of Fine Aggregate; Replacement of Cement
|12. Civil IJCE Behaviour Of SUSHOVAN DUTTA|
In the present study, laboratory experimental investigations has been carried out on bamboo made geocells to check its efficacy as alternative encasements. A series of unconfined compression tests were carried out on single bamboo geocells filled with stone aggregates by a strain controlled Universal Testing Machine. The circular perforated cells were prepared by using easily available well finished bamboo sticks of 10 mm width...
Keywords: Bamboo Geocell; Compressive Strength; Geogrid; Infill Material; Jute Geotextile; Opening Size
|4. Behavior Of Ternary.full|
Many researchers have studied the properties of ordinary Portland cement concrete by using mineral admixtures like fly ash, micro silica rise husk ash, GGBS as cement replacement materials. A few researchers have done work for triple blended concrete’s using mineral admixtures like micro silica, fly ash. Mineral admixtures are used in order to increase strength and to improve durability of concrete...
Keywords: Water Binder Ratio; Ternary Blended Concretes; Compressive Strength; Split Tensile Strength; Flexural Strength
|The Effects of Oil Contamination on the Consolidation Properties of Lateritic Soil|
Appreciable quantities of used motor oil spills are common at and around mechanic workshops. Laboratory testing program was carried out to determine the effect of used motor oil contamination on the strength and consolidationproperties of lateritic soils. Contaminated specimens were prepared by mixing the soil with used motor oil based on weight of dry soil in order to evaluate the usefulness or otherwise of oil contaminated soils in engineering construction...
Keywords: Coefficient of Consolidation; Coefficient of Volume Compressibility; Lateritic Soil; Unconfined Compressive Strength (UCS); Used Motor Oil
|Collisionless sheaths between field-modified emitters and thermally ionized plasmas exemplified by cesium - Morris, J. F|
Iterative calculation model and results for plane collisionless sheaths between field modified emitter and thermally ionized cesium plasma
Keywords: BERYLLIUM ALLOYS; CONSTRUCTION MATERIALS; JOINING; METAL WORKING; COMPRESSIVE STRENGTH; SPACECRAFT STRUCTURES; TENSILE PROPERTIES; THERMODYNAMIC PROPERTIES
|Communications systems research - Sequential decoding - NON|
Error probability and performance of Pioneer-type sequential decoding communications system with noisy oscillators
Keywords: ANTENNA ARRAYS; SPACECRAFT STERILIZATION; FOAMS; SPACECRAFT COMMUNICATION; STEERABLE ANTENNAS; ANTENNA RADIATION PATTERNS; APERTURES; CAVITIES; COMPRESSIVE STRENGTH; RADIATORS
|Silicon-etalon fiber-optic temperature sensor - Beheim, Glenn|
A temperature sensor is described which consists of a silicon etalon that is sputtered directly onto the end of an optical fiber. A two-layer protective cap structure is used to improve the sensor's long-term stability. The sensor's output is wavelength encoded to provide a high degree of immunity from cable and connector effects. This sensor is extremely compact and potentially inexpensive.
Keywords: EUTECTIC COMPOSITES; FRICTION; SLIDING; METAL POWDER; POWDER METALLURGY; REFRACTORY MATERIALS; SELF LUBRICATING MATERIALS; TRIBOLOGY; WEAR TESTS; CHROMIUM CARBIDES; COMPRESSIVE STRENGTH
|Effect of size and number of outlet pipes on design of collectors for rating and testing axial-flow compressors - Moses, Jason J|
No Abstract Available
Keywords: CIRCULAR CYLINDERS; CLAMPS; THEORIES; TESTS; ANALOGIES; CRITICAL LOADING; AXIAL COMPRESSION LOADS; COMPRESSIVE STRENGTH; BUCKLING; THIN WALLS; LENGTH; EDGES; SUPPORTS
|Directions for programming in FORTRAN 77 - Schuster, Hildegar|
Programming rules for FORTRAN 77 are introduced in order to reduce long-term costs of software development and maintenance. General rules are given for the preparation of programs and subroutines, for arithmetic expressions, character quantities, DO-instruction, instruction number, forbidden FORTRAN 77 instructions, input/output functions, code boxes, software and hardware-dependent functions, and program documentation.
Keywords: COMPRESSIVE STRENGTH; EPOXY RESINS; GRAPHITE-EPOXY COMPOSITES; REINFORCING FIBERS; IMPACT STRENGTH; MODULUS OF ELASTICITY; NOTCH SENSITIVITY; STRAIN HARDENING; TENSILE STRESS
|Aerospace Medicine and Biology: A Continuing Bibliography with Indexes - NON|
This report lists reports, articles and other documents recently announced in the NASA STI Database.
Keywords: IMPACT DAMAGE; LOW SPEED; MOMENTUM; NONLINEARITY; RESIDUAL STRENGTH; ENERGY LEVELS; FAILURE; IMPACT STRENGTH; IMPACTORS; COMPRESSIVE STRENGTH; FLAT PLATES; ISOTROPY; LAMINATES
|NASA Soil Moisture Data Products and Their Incorporation in DREAM - Blonski, Slawomir|
NASA provides soil moisture data products that include observations from the Advanced Microwave Scanning Radiometer on the Earth Observing System Aqua satellite, field measurements from the Soil Moisture Experiment campaigns, and model predictions from the Land Information System and the Goddard Earth Observing System Data Assimilation System. Incorporation of the NASA soil moisture products in the Dust Regional Atmospheric Model is possible through use of the satellite observations of soil mois...
Keywords: COMPRESSIVE STRENGTH; IMPACT DAMAGE; SANDWICH STRUCTURES; PANELS; KINK BANDS; FAILURE MODES; LOADS (FORCES); FAR FIELDS; FRACTURE STRENGTH
|The 5-6 December 1991 FIRE IFO 2 Jet Stream Cirrus Case Study: Possible Influences of Volcanic Aerosols - Sassen, Kenneth|
In presenting an overview of the cirrus clouds comprehensively studied by ground based and airborne sensors from Coffeyville, Kansas, during the 5-6 December 1992 First ISCCP Regional Experiment (FIRE) intensive field observation (IFO) case study period, evidence is provided that volcanic aerosols from the June 1991 Pinatubo eruptions may have significantly influenced the formation and maintenance of the cirrus...
Keywords: IMPACT STRENGTH; LOAD DISTRIBUTION (FORCES); CARBON; RESIDUAL STRESS; EPOXY MATRIX COMPOSITES; PRESTRESSING; STRAIN DISTRIBUTION; IMPACT TESTS; COMPRESSION LOADS; COMPRESSIVE STRENGTH; DROP TOWERS; IMPACT LOADS
|Influence of porosity on the mechanical properties of metal ceramic copper and cu-al alloy (vliyaniye poristosti na mekhanicheskiye svoystva metallokeramicheskoy medi i splava cu-al) - Itin, V. I.|
Hardness and compressive strength of copper and copper-aluminum alloy prepared by powder, metallurgical methods investigated as function of porosity
Keywords: ALUMINUM ALLOYS; POWDER METALLURGY; ALUMINUM ALLOY; COMPRESSIBILITY; COPPER; COPPER ALLOY; POROSITY; POWDER METALLURGY; CERAMICS; COMPRESSIBILITY; COMPRESSIVE STRENGTH; COPPER ALLOYS; HARDNESS; MECHANICAL PROPERTIES; METAL POWDER; POROSITY
|Investigation of Different Constituent Encoders in a Turbo-code Scheme for Reduced Decoder Complexity - Kwatra, S. C., et al|
A large number of papers have been published attempting to give some analytical basis for the performance of Turbo-codes. It has been shown that performance improves with increased interleaver length. Also procedures have been given to pick the best constituent recursive systematic convolutional codes (RSCC's). However testing by computer simulation is still required to verify these results. This thesis begins by describing the encoding and decoding schemes used...
Keywords: POLYMER MATRIX COMPOSITES; CYCLES; FAILURE; FATIGUE LIFE; TEMPERATURE EFFECTS; MICROSCOPY; TENSILE PROPERTIES; MODELS; RESIDUAL STRENGTH; COMPRESSION TESTS; COMPRESSIVE STRENGTH; FATIGUE (MATERIALS); CARBON FIBERS; POLYIMIDE RESINS; DAMAGE ASSESSMENT; STIFFNESS
|Ecological Building: additives clay minerals synthetic|
Ecological Building: additives clay minerals synthetic
Keywords: soil; additives; clay; cement; lime; soils; practical; stabilisation; earth; synthetic; synthetic practical; practical action; portland cement; action technical; stabilised soil; order online; development bookshop; compressive strength
|NASA Video Catalog - NON|
This issue of the NASA Video Catalog cites video productions listed in the NASA STI Database. The videos listed have been developed by the NASA centers, covering Shuttle mission press conferences; fly-bys of planets; aircraft design, testing and performance; environmental pollution; lunar and planetary exploration; and many other categories related to manned and unmanned space exploration. Each entry in the publication consists of a standard bibliographic citation accompanied by an abstract...
Keywords: MACHINING; COMPRESSIVE STRENGTH; VISCOSITY; THERMODYNAMICS; LOW MOLECULAR WEIGHTS; FAILURE ANALYSIS; MOLDS; SEATS; POLYMERS; MANUFACTURING; MECHANICAL PROPERTIES; GAS VALVES; DENSITY (MASS/VOLUME); DIMENSIONAL ANALYSIS
|Fast causal multicast - Birman, Kenneth P.|
A new protocol is presented that efficiently implements a reliable, causally ordered multicast primitive and is easily extended into a totally ordered one. Intended for use in the ISIS toolkit, it offers a way to bypass the most costly aspects of ISIS while benefiting from virtual synchrony. The facility scales with bounded overhead. Measured speedups of more than an order of magnitude were obtained when the protocol was implemented within ISIS...
Keywords: CERAMIC MATRIX COMPOSITES; FRACTURE STRENGTH; FRACTURING; HYDROLYSIS; METHYL COMPOUNDS; PH; PHENYLS; PYROLYSIS; TENSILE TESTS; CERAMICS; COPOLYMERS; MOLECULAR STRUCTURE; RHEOLOGY; STRESS-STRAIN RELATIONSHIPS; AMORPHOUS MATERIALS; BRITTLENESS; COMPRESSIVE STRENGTH
|Modelling decision-making by pilots - Patrick, Nicholas J. M|
Our scientific goal is to understand the process of human decision-making. Specifically, a model of human decision-making in piloting modern commercial aircraft which prescribes optimal behavior, and against which we can measure human sub-optimality is sought. This model should help us understand such diverse aspects of piloting as strategic decision-making, and the implicit decisions involved in attention allocation...
Keywords: CARBON FIBER REINFORCED PLASTICS; PERFORMANCE PREDICTION; SANDWICH STRUCTURES; HYBRID COMPOSITES; IMPACT DAMAGE; IMPACT TOLERANCES; RESIDUAL STRENGTH; BEAMS (SUPPORTS); COMPRESSIVE STRENGTH; FOAMS; HOLE GEOMETRY (MECHANICS)
|Automated Theorem Proving in High-Quality Software Design - Schumann, Johan|
The amount and complexity of software developed during the last few years has increased tremendously. In particular, programs are being used more and more in embedded systems (from car-brakes to plant-control). Many of these applications are safety-relevant, i.e. a malfunction of hardware or software can cause severe damage or loss. Tremendous risks are typically present in the area of aviation, (nuclear) power plants or (chemical) plant control...
Keywords: COMPOSITE STRUCTURES; FLEXURAL STRENGTH; COMPRESSIVE STRENGTH; REINFORCEMENT (STRUCTURES); SANDWICH STRUCTURES; YIELD POINT; TENSILE STRENGTH; SHEAR STRENGTH; IMPACT TESTS; KEVLAR (TRADEMARK); RESIN TRANSFER MOLDING
|Design-Filter Selection for H2 Control of Microgravity Isolation Systems: A Single-Degree-of-Freedom Case Study - Hampton, R. David|
Many microgravity space-science experiments require active vibration isolation, to attain suitably low levels of background acceleration for useful experimental results. The design of state-space controllers by optimal control methods requires judicious choices of frequency-weighting design filters. Kinematic coupling among states greatly clouds designer intuition in the choices of these filters, and the masking effects of the state observations cloud the process further...
Keywords: COMPRESSIVE STRENGTH; INTERLAMINAR STRESS; STRESS CONCENTRATION; BEARINGS; LAMINATES; PINS; TEMPERATURE EFFECTS; THERMAL STRESSES; COMPRESSION LOADS; FINITE ELEMENT METHOD; THREE DIMENSIONAL MODELS
|INTERNATIONAL GEOPHYSICAL YEAR BIBLIOGRAPHY OF LITERATURE IN THE RUSSIAN LANGUAGE FOR 1958 - ZATRUTINA, R. F.|
THIS PRESENT BIBLIOGRAPHY, WHICH CONTAINS THE TITLES OF 625 BOOKS AND ARTICLES DEVOTED TO GENERAL AND SPECIALIZED QUESTIONS OF THE INTERNATIONAL GEOPHYSICAL YEAR, IS CONTINUATION OF THE PUBLICATION '' INTERNATIONAL GEOPHYSICAL YEAR-BIBLIOGRAPHY OF LITERATURE THE RUSSIAN LANGUAGE FOR 1954-1957''
Keywords: SANDWICH STRUCTURES; BRAZING; FAILURE; STAINLESS STEELS; COMPRESSIVE STRENGTH; HIGH TEMPERATURE TESTS; HEAT RESISTANT ALLOYS; CORRUGATED PLATES; HONEYCOMB CORES; HIGH TEMPERATURE ENVIRONMENTS; BUCKLING
|Surface Modeling, Grid Generation, and Related Issues in Computational Fluid Dynamic (CFD) Solutions - NON|
The NASA Steering Committee for Surface Modeling and Grid Generation (SMAGG) sponsored a workshop on surface modeling, grid generation, and related issues in Computational Fluid Dynamics (CFD) solutions at Lewis Research Center, Cleveland, Ohio, May 9-11, 1995. The workshop provided a forum to identify industry needs, strengths, and weaknesses of the five grid technologies (patched structured, overset structured, Cartesian, unstructured, and hybrid), and to exchange thoughts about where each tec...
Keywords: COMPOSITE STRUCTURES; DEGRADATION; FIBER STRENGTH; MECHANICAL PROPERTIES; COMPRESSIVE STRENGTH; DELAMINATING; EPOXY MATRIX COMPOSITES; FIBER COMPOSITES; FRACTURE STRENGTH; REINFORCING FIBERS; TENSILE STRENGTH; AUTOCLAVES
|A practical approach for minimum time control of the Spacecraft Control Laboratory Experiment (SCOLE), appendix A - Kaufman, H.|
The Space COntrol Laboratory Experiment (SCOLE) is a challenge for control engineering applications. This is a result of the system dynamics, the available measurement information, the actuator capabilities and finally the specified performance requirements set. Results on the use of Model Reference Adaptive Control were reported. In view of the necessity for rapid response, this work deals with an optimal control formulation, with a minimum time requirement and constrained input...
Keywords: COMPRESSION TESTS; RESIN MATRIX COMPOSITES; STRESS-STRAIN RELATIONSHIPS; TEMPERATURE DISTRIBUTION; COMPRESSIVE STRENGTH; ELASTOPLASTICITY; FIBER COMPOSITES; PEEK; POLYMER MATRIX COMPOSITES; AXIAL STRAIN; FAILURE MODES; MODULUS OF ELASTICITY
|CVD silicon carbide monofilament reinforced SrO-Al2O3-2SiO2 (SAS) glass-ceramic composites - Bansal, Narottam P|
Unidirectional CVD SiC fiber-reinforced SrO.Al2O3.2SiO2 (SAS) glass-ceramic matrix composites have been fabricated by hot pressing at various combinations of temperature, pressure and time. Both carbon-rich surface coated SCS-6 and uncoated SCS-0 fibers were used as reinforcements. Almost fully dense composites have been obtained. Monoclinic celsian, SrAl2Si2O8, was the only crystalline phase observed in the matrix from x-ray diffraction...
Keywords: EPOXY MATRIX COMPOSITES; COMPRESSIVE STRENGTH; FAILURE MODES; FATIGUE LIFE; IMPACT LOADS; LAY-UP; REINFORCING MATERIALS; TEXTILES; FATIGUE (MATERIALS); FATIGUE TESTS; IMPACT DAMAGE; REINFORCING FIBERS; STRESS-STRAIN RELATIONSHIPS; WOVEN COMPOSITES; CARBON FIBERS; COMPRESSION LOADS
|A Fuzzy Expert System for Fault Management of Water Supply Recovery in the ALSS Project - Tohala, Vapsi J|
Modeling with a new software is a challenge. CONFIG is a challenge and is design to work with many types of systems in which discrete and continuous processes occur. The CONFIG software was used to model the two subsystem of the Water Recovery system: ICB and TFB. The model worked manually only for water flows with further implementation to be done in the future. Activities in the models are stiff need to be implemented based on testing of the hardware for phase III...
Keywords: INTERMETALLICS; EXTRUDING; GRAIN BOUNDARIES; HIGH TEMPERATURE; POWDER (PARTICLES); CRYOGENICS; MODULUS OF ELASTICITY; CREEP PROPERTIES; ALUMINUM NITRIDES; NICKEL ALUMINIDES; MILLING (MACHINING); MECHANICAL PROPERTIES; ROASTING; OXIDE DISPERSION STRENGTHENING; COMPRESSIVE STRENGTH; MATERIALS TESTS
|Effects of water-landing impact on an orbital capsule from the standpoint of occupant protection - Hatch, Howard G., Jr|
No Abstract Available
Keywords: BEAMS (SUPPORTS); THIN WINGS; WEBS (SUPPORTS); WEIGHT REDUCTION; FABRICATION; FLAT PLATES; SHEAR STRENGTH; STRUCTURAL DESIGN; STRUCTURAL FAILURE; BUCKLING; COMPRESSIVE STRENGTH; CORRUGATING; ORTHOTROPIC PLATES; RIBS (SUPPORTS); SANDWICH STRUCTURES; STIFFENING; STRUCTURAL STABILITY
|Unstructured Adaptive (UA) NAS Parallel Benchmark - Feng, Huiyu|
We present a complete specification of a new benchmark for measuring the performance of modern computer systems when solving scientific problems featuring irregular, dynamic memory accesses. It complements the existing NAS Parallel Benchmark suite. The benchmark involves the solution of a stylized heat transfer problem in a cubic domain, discretized on an adaptively refined, unstructured mesh.
Keywords: FUEL VALVES; LIFE CYCLE COSTS; POLYTETRAFLUOROETHYLENE; RELIABILITY; LEAKAGE; THRUSTORS; COMPRESSIVE STRENGTH; TEMPERATURE DEPENDENCE; MONOMETHYLHYDRAZINES; NITROGEN TETROXIDE; SPACE SHUTTLE ORBITERS; EXTRUDING; SEALS (STOPPERS); AIRCRAFT PILOTS; REACTION KINETICS; HYPERGOLIC ROCKET PROPELLANTS; CONTROL SYSTEMS DESIGN; FAILURE ANALYSIS
|Pump CFD code validation tests - Brozowski, L. A|
Pump CFD code validation tests were accomplished by obtaining nonintrusive flow characteristic data at key locations in generic current liquid rocket engine turbopump configurations. Data were obtained with a laser two-focus (L2F) velocimeter at scaled design flow. Three components were surveyed: a 1970's-designed impeller, a 1990's-designed impeller, and a four-bladed unshrouded inducer. Two-dimensional velocities were measured upstream and downstream of the two impellers...
Keywords: COMPRESSIVE STRENGTH; VINYL POLYMERS; ADVANCED SOLID ROCKET MOTOR (STS); AGING (MATERIALS); COMPOSITE MATERIALS; COMPRESSION TESTS; CORES; DRYING; STRAIN RATE; TENSILE TESTS; HUMIDITY; LOADING RATE; MOISTURE; POISSON RATIO; SOLUBILITY; TENSILE STRENGTH; THERMAL EXPANSION; THERMODYNAMIC PROPERTIES
|Concrete Engineers' Handbook - George Hool and Nathan C. Johnson|
Book digitized by Google and uploaded to the Internet Archive by user tpb.
Keywords: concrete; steel; cement; beam; center; stresses; column; slab; beams; handbook; negative moment; plain concrete; bending moment; dead load; live load; bond stress; portland cement; neutral axis; compressive strength; column capital
Downloads: 4,759 (4 reviews)
|Fernando Pacheco Torgal, Said Jalali - Eco-efficient Construction and Building Materials|
Fernando Pacheco Torgal, Said Jalali - Eco-efficient Construction and Building Materials
Keywords: concrete; materials; cement; construction; waste; wastes; strength; authors; concr; cem; cem concr; concr res; compressive strength; constr build; build mater; building materials; fly ash; earth construction; portland cement; embodied energy
|Laboratory instrumentation and techniques for characterizing multi-junction solar cells for space applications - Woodyard, James R|
An integrated system is described which consists of a spectral radiometer and dual-source solar simulator, and personal computer based current-voltage and quantum efficiency equipment. The spectral radiometer is calibrated using a tungsten-halogen standard lamp with a calibration based on NIST scales. The quantum efficiency apparatus includes a photodiode calibrated using NIST scales and a monochromatic probe beam...
Keywords: EPOXY MATRIX COMPOSITES; RODS; RIGID STRUCTURES; PANELS; WINGS; COMPRESSION TESTS; STRESS INTENSITY FACTORS; AXIAL LOADS; TOLERANCES (MECHANICS); BOLTED JOINTS; AIRCRAFT STRUCTURES; REINFORCEMENT (STRUCTURES); TENSILE STRESS; COMPRESSIVE STRENGTH; STRESS ANALYSIS; AXIAL STRESS; DYNAMIC STRUCTURAL ANALYSIS
|Ecological Building: Building With Earth-A Handbook|
Ecological Building: Building With Earth-A Handbook
Keywords: soil; earth; mud; clay; cement; soils; content; bricks; blocks; building; clay content; water content; optimum water; rammed earth; mud bricks; compressive strength; high clay; moisture content; earth walls; mud brick
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